Easy enough: You are not using color management and thus the colors look different on different screens because you are not adjusting them with those alternate displays in mind. That asudf online services will always mangle your files and change the appearance ever so slightly. You cannot do anything about this part, but you sure can improve your baseline results by using CM.
Easy enough: You are not using color management and thus the colors look different on different screens because you are not adjusting them with those alternate displays in mind. That asudf online services will always mangle your files and change the appearance ever so slightly. You cannot do anything about this part, but you sure can improve your baseline results by using CM.
There are so many different screens out there. You cannot know that. Embedding a color profile into your file might give you a chance to at least meet those color managed screens. But you still never know what Facebook and others do with that profile. So: you cannot know it.
CM = color management. You should use it, although in screen design you won't be able to control how everyone on the planet sees your color.